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Brian Wood, left, and R. J. Mere, both members of Kennebunk-based NERDS (New England Radio Discussion Society), work the airwaves from a base camp behind the New School on York Street, as part of Amateur Radio Field Day 2018. An annual 24-hour event in which radio clubs around the world practice making contact with each other, Field Day is the largest emergency preparedness drill in the country, staged every year since 1933 and now involving more than 35,000 ham radio operators in the U.S. and Canada. (Duke Harrington photo)